Pictures: Four American women reach US Open semi-finals
Four American women have made it through to the semi-finals at the US Open in New York.
For the first time since 1981, four American women have made it through to the semi-finals at the US Open in New York.
Venus Williams' victory over Petra Kvitova makes this her 23rd Grand Slam semi-final.
The match went to three sets and was decided in a final-set tie-break, which Venus managed to edge.
"I have to say I felt every single one of you guys behind me - all 23,000," Williams told the crowd. "I didn't want to let you guys down."
She'll play Sloane Stephens, who has reached the semi-finals at the US Open for the first time.
Sloane, who is returning from a foot injury, beat Anastasija Sevastova 6-3 3-6 7-6 (7-4).
Coco Vandeweghe reached the US Open semi-finals with a straight-set win.
She beat Karolina Pliskova and also ended her reign as world number one. Wimbledon champion Garbine Muguruza will now take the top spot.
Madison Keys was the last American through to the last four, beating Kaia Kanepi. "I was real nervous today," she said. "The car ride over I was definitely feeling it, but once I got out here I felt really good."